If the direction angle of vector a is 100 degrees, with a magnitude of 8, and the direction angle of vector c is 60 degrees, with a mangitude of 13, find the magnitude of resultant a + c.
I know how to set this up and solve it, but for some reason I can't get the right answer.

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Here's what I did:
|dw:1358034696496:dw|
\[x = \sqrt{8^2 + 13^2 - 2(8)(13)(\cos 140°)}\]

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